Keywords :
River Semois (Meuse), Fish-fauna; barbel-zone, Barbus barbus; eutrophication, organic pollution
Abstract :
[en] Fish surveys by electrofishing in the Semois (a tributary of the River Meuse) in 1977 showed the effects of a marked organic population (upper reaches) of the Semois and a serious eutrophication (lower reaches) on the fish fauna. There was : 1) elimination or reduction of populations of C. gobio, S. trutta, A. bipunctatus, B. barbus and C. nasus.; 2)replacement of B.barbus by L. cephalus ; 3) reduction of the relative biomass of the group B.barbus+ C. nasus which is a good indicator of the structural stability of the fish-coenosis; 4) reduction of the total biomass of fish. These results illustrate certain aspects of differences in pollution sensitivity (of an ecophysiological nature) and resilience (of a demographic nature)between fish species that are typical of this type of river (barbel zone).
Name of the research project :
Demographie et productivité des poissons dans les eaux douces de Wallonie
Scopus citations®
without self-citations
1